ScotRail is urging commuters in Lanarkshire to check their journey before travelling as a RMT overtime ban gets underway.
Some late cancellations are expected when the trade union members follow an instruction from the RMT not to work any overtime.
The ban on overtime and rest day working is part of action short of a strike from the RMT and follows the 24-hour strike action on Monday, October 10, resulting from a pay dispute with ScotRail.